Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 850mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-75S
The AirTAC SAIJ125X850-75-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. Equipped with a 32mm SUS420J2 stainless steel rod and PT tapered ports, it delivers 6136N of push force at 0.5MPa. The integrated -S magnet supports AirTAC CMSE reed and DMSE solid-state sensors, fitting neatly into the dual-sided extruded aluminum barrel grooves.
This specific SKU provides an 850mm nominal stroke with a 75mm adjustment range, yielding a usable travel window of 775-850mm. The external rear stopper screw allows precise end-position tuning during commissioning without requiring physical cylinder replacement. The adjuster acts strictly as a travel stop to set the retract position, not as a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 850 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×850 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-75S Is Used
Variable Length Diverter
Set exact retract distances on packaging lines to handle varying box sizes without swapping out the entire actuator assembly.
Machine Format Changeover
Dial in the 775-850mm travel window during product line transitions to accommodate new pallet dimensions quickly.
Long-Stroke End Tuning
Fine-tune the final resting position of heavy 125mm bore equipment at commissioning, avoiding the need for custom external spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-75S the Right Cylinder?
When sizing this model, stepping down to an 80mm bore drops the 0.5MPa thrust to 2513N, while stepping up to a 160mm bore raises it to 10053N. The 125mm bore achieves a maximum 1251kgf at 1.0MPa. Choose this adjustable version over a fixed SAI cylinder when machine formats require variable end-stops or product-size changeovers. Because the stroke is 850mm, the long unsupported rod is highly susceptible to side-loading; an external guide mechanism is mandatory to prevent premature seal failure. The SAIJ mounting set omits FB, CA, CB, and CR brackets, utilizing Basic, FA, LB, TC, FTC, TCM1, and TCM2 interfaces. For position holding without live air pressure, select a SAIL or BSAI cylinder instead of relying on the rear stopper.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-75S FAQ
At 0.5MPa it provides 6136N of push force and 5734N of pull force. At the maximum operating pressure of 1.0MPa, it achieves 1251kgf.
The rear adjuster screw lets you trim the effective travel back by up to 75mm, creating a 775-850mm usable window. It acts as a physical stop to set the end position and does not lock the load without air pressure.
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Standard models usually ship in 3-4 days.
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